Temat: Phase2 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Tunnel support design by comparison of empirical and finite element analysis of the Nahakki Tunnel in Mohmand Agency, Pakistan
Autorzy:: Riaz, A.
Jamil, S. M.
Asif, M.
Akhtar, K.
Powiązania:: https://bibliotekanauki.pl/articles/178620.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: rock mass strength parameters
rock mass classification
FEM analysis
Phase2
tunnel support design
Opis:: The paper analyses the geological conditions of study area, rock mass strength parameters with suitable support structure propositions for the under construction Nahakki tunnel in Mohmand Agency. Geology of study area varies from mica schist to graphitic marble/phyllite to schist. The tunnel ground is classified and divided by the empisical classification systems like Rock mass rating (RMR), Q system (Q), and Geological strength index (GSI). Tunnel support measures are selected based on RMR and Q classification systems. Computer based finite element analysis (FEM) has given yet another dimension to design approach. FEM software Phase2 version 7.017 is used to calculate and compare deformations and stress concentrations around the tunnel, analyze interaction of support systems with excavated rock masses and verify and check the validity of empirically determined excavation and support systems.
Źródło:: Studia Geotechnica et Mechanica; 2016, 38, 1; 75-84
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The phase separation phenomenon in the Na2O–B2O3–SiO2–Fe2O3 glass-forming system and its application for producing porous glasses
Autorzy:: Konon, Marina
Antropova, Tatyana
Polyakova, Irina
Anfimova, Irina
Dikaya, Lidiya
Semenova, Ekaterina
Kurilenko, Ludmila
Powiązania:: https://bibliotekanauki.pl/articles/173829.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: Na2O–B2O3–SiO2–Fe2O3 glass-forming system
phase separation
crystallization
phase separation diagram
chemical durability
magnetite
leaching
porous glass
Opis:: Glasses in the Na₂O–B₂O₃–SiO₂–Fe₂O₃ system with a constant SiO₂ content 70 mol% were synthesized using conventional melting in platinum crucibles in SiC-furnace in air. After synthesis and annealing, glasses were heat treated at 550°C for 96–144 hrs to promote phase separation. A tentative region of phase separation for this temperature was outlined. X-ray powder diffractometry results showed three iron-containing phases (Fe₃O₄, FeSiO₃ and β-Fe₂O₃) forming in the investigated glasses with magnetite being the main phase as it is observed in most of the glasses. Chemical durability studies showed that compositions of phase-separated glasses suitable for synthesis of porous glasses, both iron-free and iron-containing lie in between 4 and 8 mol% of Na₂O. Bulk samples of porous glasses were obtained within the chosen region having the following parameters: specific surface area 40–185 m²/g, porosity 30%–45%, pore diameter 3–14 nm. The parameters of porous structure of iron-containing porous glasses are of the same order of magnitude as the porous glass used for the multiferroic nanocomposite synthesis.
Źródło:: Optica Applicata; 2019, 49, 3; 437-444
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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